TITLE

Internal photoemission in solar blind AlGaN Schottky barrier photodiodes

AUTHOR(S)
Duboz, Jean-Yves; Grandjean, Nicolas; Omnes, Franck; Mosca, Mauro; Reverchon, Jean-Luc
PUB. DATE
February 2005
SOURCE
Applied Physics Letters;2/7/2005, Vol. 86 Issue 6, p063511
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have analyzed the photoresponse of solar blind AlGaN Schottky barrier photodiodes below the alloy band gap energy, in the 3.5–4.5 eV range, and we show that it is dominated by internal photoemission. The n-type Schottky barrier height is shown to increase linearly with the band gap energy of the AlGaN alloy. The amplitude of the internal photoemission signal is about 20 times smaller than the value given by the Fowler theory based on a free electron model. We explain this result by taking into account the interband transitions and the ballistic transport of photoexcited electrons in the metal. This low value of internal photoemission allows us to achieve a spectral rejection ratio between 280 and 320 nm of more than 3 decades.
ACCESSION #
16345433

 

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